I’ve got one. Sidecut, precisely. Got it for more 1 1/2 years now and I still love it. I can’t imagine myself with another cut anymore.
But I think not everyone can pull it off. Have you tried to tuck one side of your hair tightly behind? That may could give you an idea how you’d look like with a side/undercut. It takes forever to grow out an undercut, so you should be pretty sure.